Scalper and grader



(NoModeL) ENOBLE &a H. SNYDER.

SCALPER AND GRADER.

,P tented'Se t 1 18911.

W//////////////LN UNITED STATES PATENT OFFICE.

FRANK. NOBLE AND HIRAM SNYDER, OF MINNEAPOLIS, MINNESOTA.

SCALPER AND GRADER.

SPECIFICATION forming part of Letters Patent No. 458,592, dated September 1, 1891.

Application filed May ll, 1891.

To (oli whom it may o ncern:

Be it known that we, FRANK. NOBLE and HIRAM SNYDER, of Minneapolis, in the county of Hennepin and State of Minnesota, have in- Vented certain new and useful Improvenents in Scalpers and Graders; and we do hereby declare the following to be a full, clear, and exact description of the same, reference being had to the accompanying drawings, forning a part of this specification, and to the letters of reference marked thereon.

This invention relates to that class of milling appliances known as gravity scalpers, graders, and bolters -such, for instance, as disclosed in the patent to Frank. Noble, No. 440383, dated November 18, l890, to which reference is made for a complete understanding of the scalperto which the present invention is applied.

The invention consists in certain novel details of Construction and conbinations and arrangements of parts in connection with the mounting of the screens and imparting necessary movements thereto, all as will now be described, and pointed out particularly in the appended clains.

Referring to the acconpanying drawings, Figure l is a top plan view of one end of a screen, showing the mounting therefor, with the casing and part of the mounting in section. Fig. 2 is an end elevation of the same with the casing omitted and portions shown in section to discloss internal and underlying parts. Fig. 3 is an elevation of the base or supporting plate. Fig. t is a detail of the Swing or rock bar partially broken away.

Like letters of reference in the several figures indicate the same parts.

The letter A indicates the frame of the screen, and M the screen itself, said parts being of any desred Construction, preferably, however, curved, as described in the beforenentioned patent.

D D are two cross-bars, upon which the sieve or screen is mounted, said bars in turn being connected rigidly to the enlarged central portion of the spring-bars B at each side of the scalper. The spring bars or supports B may be constructed of any suitable material, preferably Wood, and at each end have the 'educed or fiexible portions b, which yield sufficiently to permit of the bodiiy movement Serial No. 392,351. (No model.)

of the screen, as will presently appear. Each end of the spring support or bar is held in an adjust-able carriage E, and the carriages for each bar are supported upon a Swing or rock bar G, pivoted centrally upon a pivot or bearing N, mounted on the casing I, (see Fig. 4,) said hearing also serving as the hearing for the shaft P for the knocker. The hearing N is preferably in the form of an enlargement on a base-plate l-I, adapted to be Secured to the casing by screws and carrying at each end studs or extensions h, against which the rockbar rests and to which it is clamped in adjusted position by the bolts and nuts L, passing through arch-shaped slotsl in the said bar.

On the shaft P is mounted a heXagonal or other shaped cam or knocker adapted to come in contact with the wear-plate K on the under surface of the spring-bar, in order to inpart a tremulous motion to the screen, such wear-plate being faced with rawhide or similar substance, (indicated by the dark portion lettered k.) e

The adj ustable carriages E, before referred to as the supports for the spring-bars, are nounted to slide in boxes g on the ends of the rock-bars and are adjusted in said boxes by the thunb-screws F, small set-screws J being provided to hold the same in adjusted position. The connections between the ends of the spring-bars and carriagcs are formed by clamps on the carrages, enbracing said ends and lined with rubber e, as shown.

It will be seen that in the present instance the enlarged central portion of the springbars is elongated sufficiently to acconnodate two cross-bars, one at each end of the enlarged portion, in order to prevent any osciliation of the sieve, while at the same time the Vibration straight forward and back is uninpaired, and by connecting the 'vhole structure and inounting it on a central pivot the inciination of the sieve may be varied without affecting the relative positions of the cam and spring-bar or wear-plate. lVhen it is desired to vary or adjust the vibration of the screen or the effect of the cani thereon, it is easily acconplished by noving the adjustable carriages, as before explained, so as to move the wear-plates nearer to or farther from thecan.

Scalpers constructed in accordance with IOO this invention are found, by reason of these simple and perfect adjustments, to have a maximum efficiency under all circumstances, it being within the skill of any ordinary attendant to nakethe necessary adj ustnents for different grades ot work or styles of screens.

Having thus described our invention, what we claim as new is 1. In a Separator, the conbination, with the screen and spring-support on which the same is nounted, of the pivoted rock-bar carrying said spring-support, substantially as described. v

2. In a Separator, the combination, with the screen and spring support on which said screen is centrally nounted, of the pivoted rock bar connected to both ends of said spring-support, substantially as described.

3. In a Separator-,the combination, with the screen and spring-support on which said screen is centraily mounted, of the pivoted rock-bar carrying said spring-support, an dadjustable connections between the ends of the spring-support and rock-bar, substantialiy as described.

4:. In a Separator, the conbination, with the screen and spring-support therefor nounted on a pivoted rock-bar, of a knocker for the screen nounted on a center coincident with the pivot of the rock-bar, whereby the inclination of the screen may be changed without altering the positions of the knocker with relation thereto, substantially as described.

5. In a Separator, the combination, with the screen, spring-support on which said screen is centrally mounted, and pivoted rock-bar connected to said spring-support at both ends, of the shaft passing through the pivot of the rock-bar, and the can on said shaft for vibrating the screen, substantially as described.

6. In a Separator, the combination, with the screen, spring-support on which it is mounted, and adjustable rock-bar, of the carriages connected to the ends of the spring-supports and adjustabiy mountedin the rock-bar, substantially as described,

&58,592

7. In a Separator, the combinati on, with the screen, spring-supports on which it is mounted, and adjustabie bars having the soekets at each end, of thecarriages carrying the springsupports fittingin said sockets, and the screws for adjusting the posit on of the carriages within the sockets,substantial1y as described.

8. In a Separator, the combination, with the screen, spring-supports on which it is centrally mounted, the centrally-pivoted adjustable rock-bars, and the adjustable carriages connecting the end of the spring-support and rock-bars, of the knocker pivoted on a center coincident with the pivot of the rock-bars,

and the wear-plate on the under side of the spring-support, with which the knocker cooperates, substantially as described.

9. In a Separator, the combination, with the screen, the two cross-bars connected thereto, and the spring-support to which said crossbars are connected, of the adj ustable rockbar connected to both ends of the springsupport, and the knocker engaging the springsupport between the cross-bars, substantially as described.

10. In a Separator, the conbination, with the screen, the spring-support on which it is nounted, and the rock-.bar connected to both ends of said spring-support, of the base-plate having the central sind-hearing on which the rock-bar is pivoted, and the projections at each side, the bolts passing through siots for holding the rock-bar in adj usted position, and the knockermounted on a shaft journaled in the hearing in the base-plate, snbstantially as described.

In testimony whereof we have hereunto set our hands in presence of two subscribing witnesses.

FRANK. NOBLE. HIRAM SNYDER.

Witnesses:

LoUIs FEESER, Jr., P. W. FARICY. 

